JP2570752B2 - Sewing machine embroidery frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an embroidery frame of a sewing machine. INDUSTRIAL APPLICATION This invention can be utilized for the embroidery frame of a small household sewing machine, for example.

(Prior Art) An embroidery frame of a conventionally provided embroidery sewing machine is a ninth embroidery frame.
As shown in the figure, an inner frame 901 that is annularly continuous, an annular outer frame 902 having a cut, and a screw member 903 are provided. Here, a nut 902c having a screw hole is attached to the protrusion 902b of the outer frame 902 located on the opposite side to the holder 902a. The other protrusion 902d of the outer frame 902 has a screw insertion hole 9
02e is formed. When attaching the cloth to the embroidery frame, the screw member 903 inserted into the screw insertion hole 902e is used.
Of the inner frame 901 and the inner surface of the outer frame 902 are pinched with the cloth.

(Problems to be Solved by the Invention) In the conventional embroidery frame, the screw member 903 is arranged in the tangential direction of the annular outer frame 902. It was difficult to operate the operation unit 903a of the screw member 903 due to insufficient clearance therebetween.
This is disadvantageous in terms of workability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an embroidery frame of a sewing machine which is advantageous in ensuring operability of a screw member.

[Structure of the Invention] (Means for Solving the Problems) An embroidery frame of a sewing machine according to the present invention has an inner frame which is continuous in a substantially rectangular frame shape and whose outer surface serves as a holding surface for pressing a cloth from one side, and an inner surface. Has a substantially square frame shape that serves as a holding surface for holding the cloth together with the outer surface of the inner frame, and a cut formed at one corner of the square, a mounting portion to be mounted on the embroidery frame holder of the sewing machine, and a cut. A first protrusion extending at one end to be formed, and a screw hole extending substantially parallel to a diagonal connecting two corners formed at the first protrusion and adjacent to the corner forming the cut; An outer frame having a second projection extending from the other end forming the cut, a screw insertion hole formed in the second projection opposite the screw hole, and extending substantially parallel to the diagonal; And a screw member which is inserted into the screw insertion hole and has a tip screwed into the screw hole. It is characterized by being arranged in a direction substantially parallel to the diagonal line.

It is preferable that the first protrusion of the outer frame covers the tip of the screw member screwed into the screw hole.

(Operation) With the cloth inserted between the inner frame and the outer frame of the embroidery frame, the screw member is turned with a fingertip to screw the tip of the screw member into the screw hole of the outer frame. Then, the gap of the outer frame is narrowed or eliminated, so that the inner surface of the outer frame approaches the outer surface of the inner frame, and the cloth is pressed by the outer surface of the inner frame and the inner surface of the outer frame.

[Embodiment] A small household embroidery sewing machine to which an embodiment of an embroidery frame according to the present invention is applied will be described below with reference to FIGS. 1 is a perspective view showing the appearance of the entire sewing machine, FIG. 2 is a plan view of the sewing machine, FIG. 3 is a bottom view of the sewing machine with a bed cover removed, and FIG. 4 is a cross-sectional view of a part of FIG. FIG. 5 is a cross-sectional view taken along the line VV of FIG. 2, FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG.
FIG. 7 is a sectional view taken along the line VII-VII of FIG. 2, and FIG. 8 is a perspective view showing the embroidery frame and the embroidery frame holder.

(Configuration) For convenience of description, the description of the sewing machine will be given prior to the description of the embroidery frame.

First, the housing 1 will be described mainly with reference to FIG. The housing 1 includes a bed housing 2 that forms a lower portion and is thinned in a height direction, an arm housing 3 that rises upward from an end of the bed housing 2 and further extends in a lateral direction, and a top opening of the arm housing 3. And a top cover 4 detachably attached. A needle plate 6 having a needle insertion hole 5 is attached to the upper surface of the bed housing 2 of the housing 1 and located below the tip of the arm housing 3.

(Sewing Mechanism of Sewing Machine) Next, a sewing mechanism of the sewing machine will be described mainly with reference to FIG. 3 and FIG. The needle bar arm 7 has a horizontally elongated arm portion 8 extending obliquely in the horizontal direction, which becomes narrower toward the tip.
And a wide and low rising portion 9 integrated with the horizontally long arm portion 8. At the tip of the needle bar arm 7, a needle bar 10,
A sewing needle 12 is attached via a slant stopper 11.
A presser bar 13 and a cloth presser 14 are attached to the tip of the needle bar arm 7. A swing shaft 15 is inserted below the rising portion 9 of the needle bar arm 7. The swing shaft 15 is horizontally supported by a bed 2a forming the upper surface of the bed housing 2 of the housing 1.

The drive motor 16 is provided in the bed housing 2 of the housing 1.
Is mounted via a bracket 16a. As apparent from FIG. 3, the driving force of the driving motor 16
7, transmitted to the main shaft 21 via the intermediate pulley 18 for reduction, the gear 19, and the large gear 20. The main shaft 21 has a top bottle crank 22 and
A needle bar crank rod 23 fitted to the cam portion 22a of the top bottle crank 22 is attached. Note that the cam portion 22a is
It is eccentric to one axis.

Beside the needle bar arm 7, a top bottle 24 for loosening or tensioning the upper thread is provided. The top bottle 24 is formed by a rising arm 25 having a low height and a horizontally long arm 26 pivotally supported by a pin 25a. A slide shaft 27 is attached to the lower end of the rising arm 25 of the top bottle 24. A bushing 28 is slidably inserted into the slide shaft 27, and the bushing 28 is sandwiched between bushing holders 29 on both sides of the slide shaft 27 in the axial direction. A top bin shaft 30 is inserted into the rising arm 25 of the top bin 24. A hook 31 for threading is provided at the tip of the horizontally long arm 26 of the top bottle 24. The hook 31 is guided substantially horizontally along the guide 32. A shuttle 33 is arranged below the needle plate 6 in the bed housing 2 of the housing 1. The shuttle 33 is held on a shuttle shaft 34 as shown in FIG. A small timing gear 35 is attached to the shuttle shaft 34. On the other hand, a large timing gear 36 (see FIG. 3) is attached to the main shaft 21. Between the large timing gear 36 and the main shaft 21 is interposed a clutch operating ring 38 which constantly connects the two. The clutch operation ring 38 is engaged with the arm 39a of the solenoid 39. Therefore, when the solenoid 39 operates, the clutch operating ring 38 opens, and the power transmission between the large timing gear 36 and the main shaft 21 is cut off. Large timing gear 36 and small timing gear
A timing belt 37 is stretched between the timing belt 37.

In this embodiment, the number of teeth of the large timing gear 36 is set to twice the number of teeth of the small timing gear 35. Therefore, when the large timing gear 36 makes one rotation, the small timing gear 35 makes two rotations. That is, when the main shaft 21 makes one rotation and the needle bar arm 7 makes one reciprocation, the shuttle 33 makes two rotations.

As shown in FIG. 3, a detection plate 40 is mounted on the main shaft 21, and a hand wheel 41 which is manually operated by a user is mounted. The rotation of the detection plate 40, that is, the rotation of the main shaft 21, is detected by the photo interrupter 40a.
The detection signal is input to the control unit.

(Embroidery Frame Driving Mechanism of Sewing Machine) An embroidery frame driving mechanism will be described. The first unit 49, which is a mechanism for moving the embroidery frame 125 in the two-dimensional Y-axis direction, is mainly shown in FIG. 3, FIG. 5, and FIG.
The description will be made mainly with reference to FIGS. 3, 7, and 5. FIG. The bed housing 2 has a first unit 49 built therein. In the first unit 49, as shown in FIG. 3, a bracket 50 is fixed by screws 51, and an idle pulley 53 is rotatably supported by a shaft 52 held by the bracket 50. A photo interrupter 54 mounted on a substrate is fixed to the bed housing 2. A fixed plate 55 is fixed to the bed housing 2 with screws 56. Between the fixing plate 55 and the bracket 50, a long Y
A guide shaft 57 extends in the Y-axis direction of the housing 1. As shown in FIG.
Consists of a base portion 58a and a guide portion 58b on the end side of the base portion 58a. Guide part 58b of first carrier 58 and linear bearing 5
The linear bearing 59 of the first carrier 58 is slidably fitted to the Y guide shaft 57 to which the component 9 is attached. Therefore, the first carrier 58 is held on the Y guide shaft 57 in a cantilever state. As shown in FIG. 3, a motor bracket 61 is fixed to the bed housing 2 with screws 60. A Y motor 63 as a first drive unit is fixed to the motor bracket 61 with screws 62. The gear 64 and the encoder disk 63a are press-fitted into the rotation shaft of the Y motor 63. Pulley bracket with screw 65 on motor bracket 61
The pulley bracket 66 holds the shaft 67 by caulking. On the shaft 67, a gear 68, a Y timing pulley 69
Are attached via a stop ring 70. Between the Y timing pulley 69 and the idle pulley 53, a Y timing belt 71 as a first drive unit is provided. The Y timing belt 71 and the first carrier 58 are connected to a belt holder 72.
Are connected via The belt holder 72 has a tongue piece 72a. When the tongue piece 72a moves in the arrow Y2 direction, it is detected by the photo interrupter 54. Therefore, the initialization signal of the carrier 58 is input to the control unit. Where the Y motor
When the 63 is driven, the Y timing belt 71 operates via the gears 64 and 68, so that the first carrier 58 is guided by the Y guide shaft 57 and is guided in the directions of arrows Y1 and Y2 shown in FIG.

The pulse encoder 73 is fixed to the motor bracket 61 via a screw 73a and a mounting plate 73b. The pulse encoder 73 is connected to the Y motor 63 via the encoder disk 63a.
The rotation speed of is detected. This detection signal is input to the control unit.

Next, the second unit 75 will be described. 2nd unit
Reference numeral 75 denotes a mechanism for moving the embroidery frame 125 in the X-axis direction, which is one direction in the two-dimensional direction, and is mainly shown in FIGS. 7 and 4. In the second unit 75, as shown in FIG.
The pulley bracket 76 is held by the motor bracket 82,
A shaft 77 is swaged to the pulley bracket 76, and a gear 78 and an X timing pulley 79 are journaled to the shaft 77 via a stop ring 80. Via a screw 81 to the first carrier 58,
One end of an X motor bracket 82 as a movable body is fixed. The X motor bracket 82 extends in the X axis direction of the sewing machine. Vertical wall 82b on one end of X motor bracket 82
A vertical wall is provided on the other end of the X motor bracket 82.
82c is provided. An X guide shaft 84 as a second guide portion extending in the X direction of the housing 1 is extended between the vertical wall portions 82b and 82c in a direction intersecting with the Y guide shaft 57 by a screw 83. An X motor 85 as a second drive unit is fixed to one end of the X motor bracket 82 via a screw 86. Also, screw 87 to X motor bracket 82
The actuator cover 89 is attached via the.
Therefore, the actuator cover 89 and the X motor bracket
It moves together with 82. An engagement projection 90 is formed at the end of the actuator cover 89, and two key-shaped ribs 91 are formed on the inner surface of the actuator cover 89. The X motor 85 and the like are covered with an actuator cover 89. As shown in FIG. 7, the groove of the key-shaped rib 91 and the vertical wall portion 82 of the X motor bracket 82
The tip of b is engaged. Therefore, lifting of the actuator cover 89 can be suppressed. As is clear from FIG.
When the X motor bracket 82 moves in the directions of the arrows Y1 and Y2, the actuator cover 89 moves in the directions of the arrows Y1 and Y2 through engagement with the key-shaped ribs 91, but can be prevented from rattling. As shown in FIG. 4, a gear is attached to the rotation axis of the X motor 85.
92, the encoder disk 94 is press-fitted, and the gears 92 and 78
And mesh. A pulse encoder 95 is attached to a vertical wall portion 82d of the X motor bracket 82 via a mounting plate 96 and a screw 97. The palace encoder 95 detects the rotation of the encoder disk 94, and thus the rotation of the X motor 85. The detection signal is input to the control unit. As shown in FIG. 4, a pulley bracket 99 is held via a screw 95 on a vertical wall portion 82c which is the other end of the X motor bracket 82,
An idle pulley 101 is rotatably held on a shaft 100 crimped to 99. An X timing belt 102 as a second driving unit is stretched between the idle pulley 101 and the gear 79. Loosen screw 98 and pulley bracket
By swinging 99, the degree of tension of the X timing belt 102 can be adjusted. An embroidery frame holder 104 as a second carrier is held by an X timing belt 102 via a belt holder 103. Here, when the X motor 85 is driven, the gear 9
2. X timing belt 1 via X timing pulley 79
02 operates, so that the embroidery frame holder 104 is guided by the X guide shaft 84, and moves along the axis of the X guide shaft 84.

As shown in FIG. 7, a shaft 105 is caulked to the vertical wall portion 82c at the other end of the X motor bracket 82,
A rotating roller 106 as a rolling element is rotatably fitted in 105. Roller 106 is bed 2a of bed housing 2.
And is rolled on the upper surface of the bed 2a. The rotating roller 106 is formed of rubber in consideration of running performance and low noise.

As shown in FIG. 7, the X guide shaft 84 and the like are covered with an actuator cover 107. An engagement hole 108 is formed at one end of the actuator cover 107, and a projection 108b is formed at the other end of the actuator cover 107. Protrusion 1
08b is fitted in the hole of the vertical wall portion 82c. The actuator cover 107 is attached to the actuator cover 89 by engaging the engagement hole 108 of the actuator cover 107 with the engagement protrusion 90 of the actuator cover 89 and fitting the projection 108b into the hole of the wall 82c. Have been. Therefore the second
When the actuator cover 89 shown in the figure moves in the directions of the arrows Y1 and Y2, the actuator cover 107 also moves integrally in the directions of the arrows Y1 and Y2. Also, as shown in FIG. 6, an engagement projection 109 is formed upward on the actuator cover 107 with a small gap S between the actuator cover 107 and the lower surface 3a of the arm housing 3. Therefore, the actuator cover 10
Even if 7 comes up and comes off, the engaging projection 109 abuts on the lower surface 3a of the arm bowing 3, which is advantageous for suppressing the actuator cover 107 from coming off. The first
As shown in the figure, the actuator cover 107 and the actuator cover 89 have a T-shape as a whole.

Next, the embroidery frame holder 104 will be described with reference to FIG. The embroidery frame holder 104 includes the projection 113 and the groove 11
2 and the upper surface 115a side is N pole and the lower surface 115b
Magnet 115 with S pole on the side and lower surface 115b of magnet 115
And a floating plate 119 having a locking portion 117a fixed to the holder body 114 with screws 116 and having a locking portion 117a, and a floating plate 119 having an elongated hole 118 applied to the upper surface 115a of the magnet 115 and fitted with the projection 113.
And formed. A long cylindrical linear bearing 120 is press-fitted into the holder body 114, and the belt holder 103 is
Fixed at 3a. The linear bearing 120 of the holder main body 114 is fitted to the X guide shaft 84, and the holder main body 114 is guided by the X guide shaft 84. The groove 112 of the embroidery frame holder 104 is slidably fitted on the guide plate 82e of the actuator cover 109. Therefore, there is no problem even if the embroidery frame holder 104 and thus the embroidery frame 125 are cantilevered with only one X guide shaft 84.

(Embroidery Frame) Next, the embroidery frame 125 will be described with reference to FIG.
The embroidery frame 125 is formed of an inner frame 126 made of a synthetic resin that is substantially continuous in a square shape, and an outer frame 127 made of a synthetic resin having a substantially square shape and having corner portions 127a to 127d. The outer surface of the inner frame 126 and the inner surface of the outer frame 127 are holding surfaces for holding the cloth. Outer frame 1
27, a cut 128 is formed at one corner 127a thereof,
A first projection 129 is formed at one end forming a cut 128,
The nut 130 is inserted into the hole of the first protrusion 129. At this time, the screw hole 131 of the nut 130 is substantially parallel to a diagonal line 133 connecting the corners 127b of the outer frame 127. Corners 127b, 127d
Is provided adjacent to the corner 127a where the cut 128 is formed. A second protrusion 132 is formed at the other end forming the cut 128. A screw insertion hole 134 substantially parallel to the diagonal line 133 is formed in the second protrusion 132 so as to face the screw hole 131. The screw member 135 is inserted into the screw insertion hole 134 along with the coiled spring 134a substantially parallel to the diagonal line 133, and the tip of the screw member 135 is screwed into the screw hole 131. Then, the inner surface of the outer frame 127 approaches the outer surface of the inner frame 126, and the cloth is sandwiched between the inner surface of the outer frame 127 and the outer surface of the inner frame 126. In this case, since the distal end of the screw member 135 is covered with the first protrusion 129, it does not protrude from the first protrusion 129. The resilient force of the spring 134a causes the screw member
903 screw loosening can be prevented.

A steel suction bracket 137 for mounting is fixed to the first protrusion 129 of the outer frame 127 by a screw 136. Notches 137a are formed on both sides of the suction bracket 137 in the width direction. The notch 137a locks with the locking portion 117a of the fixing plate 117.

(Operation) First, when attaching the cloth to the embroidery frame 125, with the cloth inserted between the inner frame 126 and the outer frame 127 of the embroidery frame 125, turn the operation unit 135 a of the screw member 135 with a fingertip to screw the cloth. Member 1
The tip of 35 is screwed into the screw hole 131 of the outer frame 127. Then outer frame 12
As the break 128 of 7 becomes narrow or disappears, the inner frame
The inner surface of the outer frame 127 approaches the outer surface of the outer frame 126, and the cloth is suppressed by the outer surface of the inner frame 126 and the inner surface of the outer frame 127.

When mounting the embroidery frame 125 on the embroidery frame holder 104, as shown in FIG.
Apply to 17 and floating board 119. At this time, suction bracket 1
Since the notch 137a of the 37 and the locking portion 117a of the fixing plate 117 are locked, the lateral displacement of the embroidery frame 125 can be prevented. As described above, as shown by the broken line W in FIG.
A closed loop of magnetic flux is formed via the suction bracket 137 and the fixing plate 117, whereby the suction bracket 137 of the embroidery frame 125 is detachably attached to the embroidery frame holder 104. At this time, when the embroidery frame 125 swings vertically during embroidery, the floating plate 119 is shifted on the upper surface 115a side of the magnet 115, but the suction bracket plate 137 and the fixed plate 117 remain in contact with each other. The magnetic flux remains closed loop.

Next, the operation of the sewing mechanism of the sewing machine will be described mainly with reference to FIG. Embroidery frame 125 as described above
The cloth is sandwiched between the outer frame 127 and the inner frame 126 of the
With the upper thread hooked on the hook 31 of the top bin 24, the operation switch is operated to drive the drive motor 16 to rotate. Then, as is apparent from FIG. 6, the rotation of the drive motor 16 causes the main shaft 21 to rotate counterclockwise in FIG. 6 via the belt 17, the intermediate pulley 18, and the large gear 20. Then
As described above, since the cam portion 22a of the top bottle crank 22 which is eccentric with respect to the axis of the main shaft 21 rotates, the connecting rod portion 23a of the needle bar crank rod 23 fitted to the cam portion 22a.
Swings up and down. Therefore, the rising portion 9 of the needle bar arm 7 moves up and down, and as a result, the needle bar arm 7 reciprocates around the swing shaft 15 in the directions of the arrows A and A 'shown in FIG. The needle 12 is inserted into the needle insertion hole 5 of the needle plate 6.

In this embodiment, as is apparent from FIG. 3, when the main shaft 21 rotates, the large timing gear 36 rotates, and the shuttle 33 is connected to the needle bar arm 7 via the timing belt 37, the small timing gear 35, and the shuttle shaft 34. When the needle bar arm 7 makes one reciprocation, the shuttle 33 rotates two times, and the needle 12 moves the embroidery frame above the needle plate 6.
When the cloth held by the needle 125 is pierced, the lower thread from the hook 33 is hooked on the upper thread hung on the needle 12, and the upper thread and the lower thread form a seam on the cloth of the embroidery frame 125. You.

Next, the operation of the top bin 24 will be described. When the main shaft 21 rotates counterclockwise, the bushing 28 rotates about the axis of the main shaft 21 in the direction of arrow C shown in FIG. At this time, the bushing 28 repeats reciprocating sliding along the length direction of the slide shaft 27, and the inclination angle of the slide shaft 27 changes. With such a change in the inclination angle of the slide shaft 27,
The rising arm 25 of the top bin 24 swings back and forth in the directions of arrow D and arrow D '. And hook 31 is guide 32
, And reciprocate almost horizontally.

Next, the operation of the mechanism for driving the embroidery frame 125 will be described. When the Y motor 63 shown in FIG. 3 is driven with the cloth held by the outer frame 127 and the inner frame 126 of the embroidery frame 125 as described above, the Y timing belt 71 is driven via the gears 64 and 68.
Operates, so that the first carrier 58 is moved to the Y guide shaft 57.
To move in the directions of arrows Y1 and Y2. When the X motor 85 is driven, the X timing belt 102 operates via the gear 92 and the timing pulley 79, so that the embroidery frame holder 104 is guided by the X guide shaft 84, and the arrows X1 and X2.
Moved in the direction. Therefore, the embroidery frame 125 held by the embroidery frame holder 104 is moved in the two-dimensional direction.

When the embroidery frame 125 moves, one end of the X motor bracket 82 is guided by the Y guide shaft 84 via the first carrier 58, as apparent from FIG.
The rotating roller 106 attached to the vertical wall portion 82c at the other end of the X motor bracket 82 rolls on the upper surface of the bed 2a of the bed housing 2 in a direction parallel to the axis of the Y guide shaft 57.

(Effect) In the present embodiment, as shown in FIG.
The screw holes 131 and the screw insertion holes 134 formed in the 27 have a configuration substantially parallel to a diagonal line 133 connecting the corners 127b and 127d.
Therefore, the screw member 135 is also substantially parallel to the diagonal line 133.
Therefore, a clearance between the operation portion 135a of the screw member 135 and the outer frame 127 can be secured, and the operation portion 135a of the screw member 135 can be easily operated with a fingertip. Further, in this embodiment, since the distal end of the screw member 135 is covered with the first projection 129, it is possible to eliminate the problem that the cloth is hooked on the distal end of the screw member 135. Further, in the present embodiment, the inner frame 126 and the outer frame 127 have a substantially rectangular frame shape. Therefore, the corner 127a, the corner 127b, the corner 127c, and the corner 127d of the square frame-shaped embroidery frame 125 can be brought close to the needle 12, and the corner 127a, the corner 127b, and the corner 127c of the embroidery frame 125 can be moved. Also, embroidery can be performed at a position near the corner 127d, which is advantageous for securing an embroidery area. In this embodiment, the second protrusion 132 and the first protrusion on the base side of the embroidery frame 125, that is, the embroidery frame holder 104 side.
The screw member 135 is located on the 129 side. Therefore, as shown in FIG. 9, since the screw member 903 is located at the front end side of the embroidery frame, unlike the conventional case in which the fingers and cloth of the operator are easily caught by the screw member 135, The trouble that the finger or the cloth gets caught on the screw member 135 can be improved.

In this embodiment, one end of the X motor bracket 82 is held by the first carrier 58 guided by the Y guide shaft 57, and the other end of the X motor bracket 82 is a vertical and horizontal portion 82c.
Is configured to be guided and held along the upper surface of the bed housing 2 via the rotating roller 106. Therefore, a single Y guide shaft 57 is sufficient as the guide shaft extending in the Y direction. The disadvantage that strict parallelism of the guide shaft is required can be solved, and the X guide shaft 84 and the first carrier 58 can be easily assembled, which is advantageous in terms of mass production and cost. Further, since only one Y guide shaft 57 is required, it is advantageous to reduce the size of the housing 1 in the X direction. In this embodiment, since the needle bar arm 7 is swung about the swing shaft 15, the height of the housing 1 is advantageously reduced. Therefore, the housing 1 can be downsized in the X direction. 1 is advantageous for reducing the overall size.

In this embodiment, the movement of the first carrier 58 in the Y direction is performed via the Y timing belt 71, and the movement of the embroidery frame holder 104 in the X direction is performed via the X timing belt 102. The length with the X timing belt 102 is substantially the same. Therefore, the extension of the Y timing belt 71 and the extension of the X timing belt 102 become substantially the same, which is advantageous for suppressing the collapse of the embroidery pattern.

[Effect of the Invention] According to the embroidery frame of the sewing machine according to the present invention, the screw holes and the screw insertion holes formed in the outer frame of the embroidery frame have a configuration substantially parallel to a diagonal line connecting the corners of the embroidery frame. Therefore, the screw member for fastening the outer frame is also substantially parallel to the diagonal line. Therefore, the clearance between the screw member and the outer frame can be secured, the screw member can be easily operated with the fingertip, and the workability can be secured.

Further, according to the embroidery frame of the sewing machine according to the present invention, the inner frame and the outer frame have a substantially rectangular frame shape. Therefore, embroidery can be performed even near the corners of the embroidery frame in the shape of a square frame, which is advantageous for securing a large embroidery area.

[Brief description of the drawings]

1 shows an embodiment of the present invention, FIG. 1 is a perspective view showing an appearance of the entire sewing machine, FIG. 2 is a top view of the sewing machine, FIG. 3 is a bottom view of the sewing machine with a bed cover removed, and FIG. FIG. 4 is a plan view showing a partial cross section and a partial cutaway, and FIG.
6 is a sectional view taken along the line VI-VI in FIG. 2, FIG. 7 is a sectional view taken along the line VII-VII in FIG. 2, and FIG. 8 is embroidery. It is an exploded perspective view of a frame. FIG. 9 is a perspective view of a conventional embroidery frame. In the drawing, 1 is a housing, 104 is an embroidery frame holder, 125 is an embroidery frame, 126 is an inner frame, 127 is an outer frame, 128 is a cut, 129 is a first protrusion, 130 is a nut, 131 is a screw hole, and 132 is The second projection 133 is a diagonal line, 134 is a screw insertion hole, 135 is a screw member, and 135a an operation unit.

Claims (2)

(57) [Claims] 1. An inner frame which is continuous in a substantially rectangular frame shape and has an outer surface serving as a holding surface for pressing the cloth from one side, and an inner surface serving as a holding surface for holding the cloth together with the outer surface of the inner frame. A cut formed at one corner of the square frame, a mounting portion mounted on the embroidery frame holder of the sewing machine, and a first extending at one end forming the cut.
A projection, a screw hole extending substantially parallel to a diagonal line connecting the two corners formed on the first projection and adjacent to the corner forming the cut, and a second end forming the cut; An outer frame having an extended second protrusion, a screw insertion hole formed in the second protrusion opposite to the screw hole, and extending substantially parallel to the diagonal line; and the screw insertion hole of the outer frame. And a screw member having a tip inserted into the screw hole and being screwed into the screw hole, wherein the screw member is arranged in a direction substantially parallel to the diagonal line. 2. The embroidery frame of a sewing machine according to claim 1, wherein the first projection of the outer frame is configured to cover a tip of a screw member screwed into the screw hole.